Data Corruption Errors

The zpool status command also shows whether any known
errors are associated with the pool. These errors might have been found during
data scrubbing or during normal operation. ZFS maintains a persistent log
of all data errors associated with a pool. This log is rotated whenever a
complete scrub of the system finishes.

Data corruption errors are always fatal. Their presence indicates that
at least one application experienced an I/O error due to corrupt data within
the pool. Device errors within a redundant pool do not result in data corruption
and are not recorded as part of this log. By default, only the number of errors
found is displayed. A complete list of errors and their specifics can be found
by using the zpool status-v option. For
example: